Works very well, high-quality appearance

We had the problem that the radio had no fahrzzeugseitige RCA outputs to an aftermarket radio was not an option. However, the additional amplifier worked extremely poor at the high-voltage inputs. So I have theoretical data are compared and chose this converter. The choice was good. Erstklassische conversion of signals, ups and downs very clear turning on the external power amp this HLC-4 also works flawlessly. However, very important. The alternators whistle has this part also does not prevent. We have then quite consistently distributes the cable car. Links the power supply (battery positive and negative continuous, no negative out of the trunk!), Twisted in center of the vehicle in the "tunnel" along the RCA cables and to each about 10cm (without twisting was whistling still there) and right on the sill, the speaker cable from the Amplifiers back to the speakers. After that, everything was pefect. That with the cables is necessary to 90% in vehicles. (Seats and carpets are expanded in 15min. And do you still like). The HLC-4 receives from me anyway a strong buy recommendation.
I've also used 15 part because that is worse in terms of sound quality seriously.